CN111060199B

CN111060199B - Optical detection system with self-checking device and self-checking method

Info

Publication number: CN111060199B
Application number: CN201911366801.9A
Authority: CN
Inventors: 钟民; 张立军; 杨帆; 戴月; 谢远; 吴若丁
Original assignee: Dirui Medical Technology Co Ltd
Current assignee: Dirui Medical Technology Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2022-07-12
Anticipated expiration: 2039-12-26
Also published as: CN111060199A

Abstract

The invention provides an optical detection system with a self-checking device, comprising: the device comprises a light-gathering component for gathering light, a detector arranged at one end of the light-gathering component, and a first self-checking device arranged on one side of the light-gathering component and used for self-checking the detector. Through set up a self-checking device in light condensing component side for the self-checking of detector in the system, when the system appears detecting unusually, detect the judgement through the solitary detector, the reason of unusual can be easy to judge, has made things convenient for the user to the maintenance of system.

Description

Optical detection system with self-checking device and self-checking method

Technical Field

The invention relates to the technical field of optical detection, in particular to an optical detection system with a self-checking device and a self-checking method.

Background

In the field of light energy detection, when an object to be detected is far away from a detector and the light emitting energy is relatively weak, a light condensing optical path is required to be used between the object to be detected and the detector, so that the light emitted by the object to be detected is collected as much as possible and is incident on the detector, generally, the light condensing optical path has two types, namely a light guide rod mode and a light condensing lens mode, wherein the light guide rod has the advantages of high light condensing efficiency, uniform emergent light spots, long light guide distance and the like, when a photoelectric sensor has a large photosensitive surface (such as a photomultiplier) and the light condensing efficiency is required to be high, the light guide rod mode is required to be used for condensing, but the light guide rod requires that the two end surfaces of the light guide rod are closer to a light emitting surface and the surface of the detector, so that the optical axis area is almost completely occupied by the light guide rod, generally, in order to ensure the accuracy of a detection system, a self-detection light source is required to be designed, and is generally placed at the optical axis at the front end of the light guide rod, however, when the system fails, for example, when the measured value is attenuated, it cannot be determined whether the optical rod is contaminated or the sensitivity of the photoelectric sensor itself is reduced, and if the specific cause of the optical system failure needs to be determined, only one self-detection optical path is directly irradiated onto the photoelectric sensor without passing through the optical rod, which makes the design very difficult.

Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a light detection system with a self-checking device and a self-checking method, which are intended to solve the problem in the prior art that the cause of an abnormality is difficult to determine when the light detection system is abnormal.

The technical scheme adopted by the invention for solving the technical problems is as follows:

in a first aspect, a light detection system with a self-test device includes: the device comprises a light-gathering component for gathering light, a detector arranged at one end of the light-gathering component, and a first self-checking device arranged on one side of the light-gathering component and used for self-checking the detector.

Optionally, the light detection system with a self-inspection device further includes a second self-inspection device for self-inspecting the light detection system, and the second self-inspection device is disposed at the other end of the light focusing component.

Optionally, the first self-inspection device includes a first self-inspection light source, a first photosensor disposed on a light exit surface side of the first self-inspection light source, and a first neutral attenuation sheet disposed on an optical axis of the self-inspection light source.

Optionally, the optical detection system with a self-inspection device, wherein the second self-inspection device includes a second self-inspection light source, a second photosensor disposed on a light exit surface side of the second self-inspection light source, and a second neutral attenuation sheet disposed on an optical axis of the self-inspection light source.

Optionally, the light detection system with a self-inspection device, wherein the light collecting component is a light guide rod or a light collecting lens.

Optionally, the light detection system with a self-inspection device may further include a second self-inspection device disposed on the optical axis of the light focusing component.

Optionally, the light detection system with a self-inspection device includes an angle between light emitted from the first self-inspection light source and an optical axis of the light focusing component is 45 to 60 degrees.

Optionally, the light detection system with a self-inspection device, wherein the first self-inspection light source is an LED light source, and the second self-inspection light source is an LED light source.

Optionally, the light detection system with a self-test device, wherein the first photosensor is a photocell and the second photosensor is a photocell.

Optionally, the light detection system with a self-test device, wherein the detector is a photon counter for light energy detection.

Has the advantages that: the invention provides an optical detection system with a self-checking device, comprising: the device comprises a light-gathering component for gathering light, a detector arranged at one end of the light-gathering component, and a first self-checking device arranged on one side of the light-gathering component and used for self-checking the detector. Through set up a self-checking device in light gathering component side for the self-checking of detector in the system, when the system appears detecting unusually, detect the judgement through solitary to the detector, can assist easy judgement unusual reason, made things convenient for the user to the maintenance of system.

Drawings

FIG. 1 is a diagram of a light detecting system with a self-testing device according to a preferred embodiment of the present invention.

Fig. 2 is a schematic diagram illustrating the working principle of the first self-testing device in the preferred embodiment of the present invention.

Fig. 3 is a schematic diagram illustrating the working principle of the second self-testing device in the preferred embodiment of the present invention.

FIG. 4 is a diagram of a comprehensive detection optical path in a preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein. .

As shown in fig. 1, an optical detection system with a self-inspection apparatus includes: the light-gathering device comprises a light-gathering component 10 for gathering light rays, a detector 20 arranged at one end of the light-gathering component 10, and a first self-checking device 30 arranged at one side of the light-gathering component 10 and used for self-checking the detector 20. Wherein, the light-focusing member 10 is a light-guiding rod or a light-focusing lens.

In the present embodiment, when an abnormality is found in the light detection system, there may be a plurality of causes for the abnormality, such as an abnormality in the light collection unit 10, an abnormality in the detector 20, or an abnormality in both the light collection unit 10 and the detector 20. The detector 20 is detected by the first self-checking device 30 arranged at the side of the light-condensing part 10, and when the detection result shows that the detection result is normal, the reason for the abnormality is mainly from the light-condensing part 10. In this case, the light focusing member 10 may be detected. In the invention, the first detection device 30 is arranged on the side surface of the light-gathering component for detection, so that the detection light emitted by the first self-detection device 30 can easily reach the detector without being influenced by other components, and the cause of the abnormal condition can be easily judged.

In the present embodiment, as shown in fig. 2, the first self-test device 30 operates as follows:

the light source 1 emits light, and a part of the light irradiates the photoelectric sensor 2 and is used for detecting the light energy of the light source 1 or self-calibrating the light emitted by the light source 1. A portion of the light impinges on the photosensitive surface of detector 20 for detecting the performance of detector 20 itself. The light source 1, the photoelectric sensor 2, the light-condensing member 10, and the detector 20 are all disposed in the darkroom 5. The darkroom described here is a space which is not transparent to light.

In the present embodiment, as shown in fig. 3-4, the second self-test device 40 works as follows:

light is emitted by the light source 3, and a part of the light irradiates the photoelectric sensor 4 for detecting the light energy of the light source or for self-calibration of light emission of the light source. A part of the light enters the light-gathering component 10 and directly irradiates the photosensitive surface of the detector 20, so as to detect the pollution and the damage of the light-gathering component 10 and the performance of the detector. The light source 3, the photosensor 4, the condensing unit 10, and the detector 20 are all disposed in the darkroom 5. The darkroom refers to a lighttight space.

In some embodiments, the first self-inspection apparatus 30 includes a first self-inspection light source 301, a first photosensor 302 disposed on a light emitting surface side of the first self-inspection light source 301, and a first neutral attenuation sheet 303 disposed on an optical axis of the self-inspection light source 301. The neutral attenuation sheet (optical attenuation sheet) is a sheet-shaped element which is made of substances with light absorption characteristics and can attenuate light intensity when placed on an optical path. The amount of light passing through the attenuation sheet depends on the type of material and also on the thickness of the material. If the standard transmittance on the attenuation sheet is 0.02, the light passes through the attenuation sheet and only transmits two percent of the original light intensity. The neutral attenuation sheet means that after light passes through the attenuation sheet, the different wavelengths are attenuated according to the same proportion.

Specifically, the self-test light source 301 is an LED light source, the second photoelectric sensor 302 is a photocell, the LED light source 301 emits light, a portion of the light directly irradiates the photocell 302, and the light energy of the LED light source is detected or self-calibrated by detecting the change in the performance of the photocell. And the other part of the light enters the detector 20 after being attenuated by the first neutral attenuation sheet 303, so that the detector 20 is subjected to self-inspection.

Further, an included angle between light emitted by the first self-detection light source and an optical axis of the light gathering component is 45-60 degrees.

Specifically, as shown in fig. 2, an included angle between light emitted by the first self-checking light-emitting source and an optical axis is a, where a may range from 45 degrees to 60 degrees. When the value a is less than 45 degrees, the diameter of the light guide rod needs to be properly reduced, otherwise, part of light can irradiate the light guide rod, the self-checking result is affected, and the performance of the whole detection equipment can be affected after the diameter of the light guide rod is reduced. When the value of a is 45 degrees, the illumination required by detection is ensured, and the light is prevented from irradiating the light guide rod. When the value a is greater than 60 degrees, the size of the light receiving surface of the detector (photon detector) needs to be increased in order to ensure illumination, so that the size of the whole detection equipment is changed correspondingly, and the production and manufacturing cost of the product is increased.

Of course, the value of the angle a can be actually adjusted according to the size and the installation mode of the equipment.

In some embodiments, with reference to fig. 1, the second self-inspection apparatus 40 includes a second self-inspection light source 401, a second photosensor 402 disposed on a light emitting surface side of the second self-inspection light source 401, and a second neutral attenuation sheet 403 disposed on an optical axis of the self-inspection light source 401.

Specifically, the self-test light source 401 is an LED light source, the second photoelectric sensor 402 is a photocell, the LED light source 401 emits light, a portion of the light directly irradiates the photocell 402, and the light energy of the LED light source is detected or self-calibrated by detecting the change in the performance of the photocell. And another part of the light rays enter the light-focusing component 10 and the detector 20 after being attenuated by the second neutral attenuation sheet 403, so that the whole system is subjected to self-inspection.

Further, the second self-inspection device 40 is disposed on the optical axis of the light condensing part 10. The second self-checking device is arranged on the optical axis of the optical path where the light-gathering component 10 is located, so that light can be gathered better.

In some embodiments, the detector 20 is a photon counter for light energy detection.

In particular, the photon counter is a very weak light pulse detection device based on a direct detection quantum limit theory. The method utilizes a single photon detection technology of a photomultiplier tube, and detects the discrete weak light pulse signal power by identifying and measuring the photon number in unit time by an electron counter. Photon counters are classified into three categories, basic type, background compensation, and radiation source compensation, according to the compensation method for external disturbances. The basic type is used in the present invention, but other two types can be used in the present invention.

The optical detection system is further explained by the specific detection method.

Specifically, referring to fig. 1, when the luminescence detection of the object to be detected is performed, the light sources of the first self-detection device and the second self-detection device are turned off, and when no luminescence test of the object to be detected is performed, the self-detection of the detector performance can be performed by turning on the light source 401, a part of the light emitted from the self-detection light source 401 is irradiated onto the photoelectric sensor 402 for the detection of the light energy of the light source 401 or the self-calibration of the luminescence of the light source 401, and a part of the light is irradiated onto the photosensitive surface of the detector 20 through the light guide rod 10 for the self-detection of the performance of the whole detection system, including the contamination 10, the fragmentation, etc. of the light guide rod and the performance detection of the detector 20 itself, if the performance of the whole optical detection system is detected to be normal, the first self-detection device does not need to be turned on, and if the detection value of the detector is detected to be abnormal, the second self-detection device 40 is turned off.

And starting a first self-detection device, performing self-detection on the detector 20, and if the detection result shows normal, judging that the light condensation component 10 has a fault.

Specifically, turning on the self-test light source 301 of the first self-test device 30 detects whether the detector 20 itself has a fault, and the detection process is as follows: turning on the self-test light source 301, irradiating a part of light emitted by the self-test light source 301 onto the photoelectric sensor 302 for detecting the energy of the self-test light source 301 or self-calibration of light emission of the self-test light source 301, irradiating a part of light onto the detector 20 obliquely relative to the optical axis of the light guide rod for detecting the performance of the detector 20, if a fault of the detector 20 is detected, it indicates that the fault of the optical system is caused by the fault of the detector 20 or the fault of the detector 20 and the light guide rod 10 at the same time, and if no fault of the detector 20 is detected, it indicates that the fault of the optical system is caused by the light guide rod 10 itself. Therefore, the user can conveniently search the abnormal reason.

In summary, the present invention provides an optical detection system with a self-inspection apparatus, comprising: the device comprises a light-gathering component for gathering light, a detector arranged at one end of the light-gathering component, and a first self-checking device arranged on one side of the light-gathering component and used for self-checking the detector. Through set up a self-checking device in light gathering component side for the self-checking of detector in the system, when the system appears detecting unusually, detect the judgement through the solitary detector, can assist easy judgement unusual reason, made things convenient for the user to the maintenance of system.

It will be understood that the invention is not limited to the examples described above, but that modifications and variations will occur to those skilled in the art in light of the above teachings, and that all such modifications and variations are considered to be within the scope of the invention as defined by the appended claims.

Claims

1. A light detection system with a self-test device, comprising: the device comprises a light-gathering component for gathering light, a detector arranged at one end of the light-gathering component and a first self-checking device arranged at one side of the light-gathering component and used for self-checking the detector;

the second self-checking device is used for self-checking the light detection system and is arranged at the other end of the light gathering component; the second self-checking device is arranged on the optical axis of the light focusing component;

the first self-checking device comprises a first self-checking light source, a first photoelectric sensor arranged on one side of a light outlet surface of the first self-checking light source and a first neutral attenuation sheet arranged on an optical axis of the first self-checking light source;

the second self-checking device comprises a second self-checking light source, a second photoelectric sensor arranged on one side of a light-emitting surface of the second self-checking light source and a second neutral attenuation sheet arranged on an optical axis of the second self-checking light source;

the self-checking method of the optical detection system comprises the following steps: turning on the second self-checking light source, wherein a part of light emitted by the second self-checking light source irradiates the second photoelectric sensor and is used for detecting the energy of the second self-checking light source, and a part of light penetrates through the light gathering component to irradiate the light sensing surface of the detector and is used for self-checking the performance of the whole light detection system;

the method for self-checking the detector comprises the following steps: turning on a first self-detection light source, wherein a part of light emitted by the first self-detection light source irradiates onto the first photoelectric sensor for detecting the energy of the first self-detection light source, and a part of light irradiates onto the detector obliquely relative to the optical axis of the light condensation component for detecting the performance of the detector; if the detector fault is detected, the reason of the fault of the optical detection system is the detector fault or the fault of the detector and the fault of the light focusing component simultaneously; if the detector is detected to be free of faults, the reason that the fault of the optical detection system is caused by the light condensation component is described;

the light-focusing component is a light-guiding rod or a light-focusing lens.

2. The light detecting system with self-test device as claimed in claim 1, wherein the angle between the light emitted from the first self-test light source and the optical axis of the light focusing member is 45-60 degrees.

3. The light detection system with self-test device according to claim 1, wherein the first self-test light source is an LED light source and the second self-test light source is an LED light source.

4. The light detection system with self-test device of claim 1, wherein the first photosensor is a photocell and the second photosensor is a photocell.

5. The light detection system with self-test device of claim 1, wherein the detector is a photon counter for light energy detection.